Universal Calendorario from Agência Constructora DOMUS, in homage to the Glorious Aviators Gago Coutinho and Sacadura Cabral.

Kalendorario is used to find the day of the week of any date from the 17th to the 20th centuries, that is, over a period of 400 years and also the year, the month, as well as the latitude and longitude of any point on the globe.